Framework design considerations

By Dr. Vishaal Bhat on Thursday 3 July 2008 with 0 comments



  • A metal occlusal contact requires 1-1.5mm of reduction
  • A porcelain contact requires 2mm of reduction
  • Occlusal contacts need to be 1.5-2.0mm from the porcelain-metal junction
  • Interproximal contacts in porcelain are easier to correct and more esthetic
  • The substructure must support an even thickness of the porcelain veneer (1mm minimum and 2mm maximum). The minimum thickness of the metal is 0.2-0.3mm.

The connectors:

width: 2x the width will double the strength

    • ½x the width will diminish the strength by ½

height: 2x the height will cube the strength

    • 1/2x the height will diminish the strength by 1/8

So, reducing the width of the connector significantly reduces its strength when compared to adjusting the height of the connector.

Cut-back: porcelain-metal junction should be 90 or greater.

Category: Prosthodontics Notes

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